Gear-truing chuck.



0. J. MARKS.

GEAR TRUING CHUCK. PPPPPPPPPPPPPPPPPPPPPPPPPP 3.

. 39 Patented Sept. 15, 1914.

' 2 SHEETS-SHEET 1.

O. J. MARKS. GEAR TRUING CHUCK.

APPLICATION IILED NOV. 26, 1913- 1,1 10,396, Patented Sept. 15,1914.

2 SHEETS-SHEET}.

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W mp rrED STATES PATENT orFrcE.

CHARLES J'. MARKS, OF NEW BRUNSWICK, NEW JERSEY.

GEAR-TRUING cnuox- Specification of Letters Patent.

Patented Sept. 15, 1914..

Applcaition filed November 26, 1913. Serial No. 803,097.

The object of my invention is toprovide a simple and efficient chuckwherein gears may be properly centered and held to enable the holesorbores in the gears, as well as the faces of the gears, to be properlyground or turned with respect to the axis as well as to the teeth of thegears.

My invention comprises novel details of improvement and combinations ofparts that will be more fully hereinafter set forth and then pointed outin the claims.

Reference is to be had to the accompanying drawings forming part hereof,wherem- Figure 1 is a central sectional view of my improved chuck; Fig.2 is a face view thereof, part of the teeth of the gear being removed;Fig. 3 is a detail edge View, en-

larged, of Fig. 1; Fig. 4 is a fragmentary view of portions of the innerand outer members of the chuck; Fig. 5 is a similar view of the innermember of the chuck; Fig. 6 is a view similar to Fig. 1, partly on theline 6, 6, in Fig. 7, illustrating a modification; Fig. 7 is an endview, partly in section on the line 7, 7, in .Fig. 6, and Fig. 8 is adetail plan view of part of the inner member of Fig. 6.

Similar numerals of reference indicate corresponding parts in theseveral views.

The numeral 1 indicates an inner member shown provided with a taperingspindle 2, adapted to fit the nose of the spindle of a grinding machineor lathe, in any wellknown manner. Member 1 is provided with a pluralityof teeth 1 adapted to fit between the teeth 3 of a gear 3 to be groundor turned, the diametrical distance between the inner surfaces of teeth1 being such that said surfaces may bear upon the material of the gearat the bottom of its teeth, as illustrated in Figs. 1 and 6, at the rimor solid portion 3* of the gear. By preference, the inner surface 1 ofteeth 1 areflaring or tapering outwardly to allow for variations anddistortions in the diameters of gears which take place whenv the arehardened. At 4 is an outer member, isposed concentrically to member 1,and shown provided With a hub orextension 4 slidably fitted upon member1, or its extension or spindle portion 2. Member 4 is shown providedw1th aset screw 5 for securing the parts'l and 4 together in setpositions. The member 4 is provided with teeth 4 properly spaced apartto fit against the face of the teeth 3 of the gear 3 when the teeth-1 ofmember 1 are between said gear teeth. In Flgs. 1 to 5 the teeth 4 fitbetween the teeth 1 of member 1. It will be seen that the teeth 1 and 4are disposed substantially parallel to the axis of their correspondingmembers 1 and 4, whereby when gear 3 is placed 1n position with theteeth 1 between its gear teeth, and teeth 4 against the faces of saidgear teeth, the gear will be properly alined with respect to the axis ofspindle 2, regardless of how the teeth 3 may have been cut, or may havebecome distorted w1th respect to the pitch line, during the hardeningprocess thereof, since the position of gear 3 and the chuck isdetermined in a radial direction by the engagement of teeth 1 with thesolid portion 3 of the gear, while the position of gear 3 in a directiontransverse to its axis, and to the axis of spindle 2 is determined bythe gear teeth 3 bearing against the ends of teeth 4". To retain thegear 3 in proper relation to the members 1 and 4, in accordance withFigs.

1 and 5, I provide a plurality of clamps 6 shown having projection 6adapted to enter.

the corresponding sockets 7 in member 4, and extending forwardly outsideof gear 3, set screws 8 being provided at the ends of said clampsadapted to bear against gear 3 or its teeth, Whereby the gear isretained set in firm position against teeth 4 of member 4, with theteeth 1 of member 1 between the teeth of the gear.

, To adjusta gear to the chuck of Figs. 1 and 5, the clamps 6 may beremoved or swung aside, the gear is placed against member 1 with theteeth 1 between the teeth of the gear, thereby determining the positionof the gear with respect to the axis of spindle 2; member 4 is set withits teeth 4* against the teeth 3 to cause the gear to assume theproperposition transverselyto the axis of spindle 2, clamps 6 are thenplaced in position, and the set screws 8 are forced against the gear orits teeth to re tation of the chuck with the gear the latter will berotated by engagement of the teeth 1 with the teeth'of the gear.

Tn Fig. 6 the member 4: is shown in sleevelike form, with its teeth 4*bearing upon the sides of the teeth of the gear opposite to he side ofthe gear where the teeth 1 of inner member 1 engages the solid portionof the gear and enter between the teeth of the latter, whereby, whenmember l is fastened to member 1 by the set screw 5, the gear 3 will besecured in proper position for rotation of the gear. In order-that gear3 may be inserted in the chuck without requiring member 4 to be removedtherefrom, I have shown member 1 provided with an angularly disposedslot 9 (Fig. 8), adaptedto receive the end of set screw 5, and sodisposed that member 4- may be drawn forwardly with the set screwpassing through the longitudinal leg 9 of the slot, and member 4 maythen be rotated upon member 1 to bring the teeth 4 into alinement withteeth 1 to permit teeth 3 of the gear to passbetween teeth 4*. and 1 tobring the solid part of the gear into engagement with the inner surfaceof the teeth 1, and then member 4 may be reversely rotated to bring itsteeth 4* in front of the teeth 3 and may bepushed back against thelatter, the screw 5 again passing through the leg 9 of slot 9, and saidscrew may then be set to hold members 1 and 4 firmly with the gearclamped securely therebetween.

In accordance with my invention chucks may be provided adapted toreceive spur or helical gears of any desired shapes or sizes, and suchgears will be accurately held with relation to their axes so that theholes or bores in the gears may be accurately and automatically trued,ground or bored, without requiring particular skill on the part of theoperator in setting the gears in the chuck, thereby saving time andexpense in grinding or boring holes or bores in gears, with more perfectresults than where gears are held by their teeth for grinding or boringtheir bores, since inequalities are liable to occur due to thedistortion of the teeth of the gears that may occur during the hardeningprocess. Changes may be made in the details of construction andarrangements of parts shown and described, within the scope of theappended claims, without departing from the spirit of the invention.

Having now described my invention what I claim is 1. A chuck comprisinga plurality of members, one of said members having teeth to receive theteeth of a gear, the other member having means to bear against the gear;and meansfor retaining said gear securely upon said members.

2. A chuck comprising a pair of members concentrically disposed, one ofsaid members having teeth disposed relatively to the teeth of a gear,the other member having teeth adapted to bear against the teeth of thegear, and means to retain the gear securely in said members.

3. A chuck comprising a pair of members concentrically disposed, one ofsaid members having teeth disposed relatively to the teeth of a gear,said teeth on their inner surfaces being outwardly tapered to bear uponthe solid portion of the gear, the other member having teeth adapted tobear against the teeth of the gear, and means to retain the gearsecurely in set position.

4. A chuck comprising a plurality of members concentrically disposed,one of said members having teeth adaptedto pass between teeth of a gear,the other member having teeth disposed between teeth of the first namedmember and adapted to bear against the opposed face of the gear, andmeans to retain said members.

5. A chuck comprising a luralitt of members concentricallydispose ,one 0said members having teeth adapted to pass between teeth of a gear, theother member having teeth .disposed between teeth of the first namedmember and adapted to bear against the opposed face of the gear, meansto secure said members together, and clamping means carried by one ofthe members to retain the gear in thechuck.

6. A chuck comprising a plurality of members concentrically disposed,one of said members having teeth adapted to pass between teeth of agear, the other member having teeth disposed between teeth of the firstnamed member and adapted to bear against the opposed face of the gear,means to secure said members together, one of said members having clampsprovided with means to retain the gear pressed against the teeth of saidmember.

7. A chuck comprising a plurality of members concentrically disposed,one of said members having teeth adapted to pass between teeth of agear, the other member having teeth disposed between teeth of the firstnamed member and adapted to bear against the opposed face of the gear,means to secure said members together, one of said members having clampsprovided with screws at their outer parts to bear against the gear toretain it pressed against the teeth of said member.

8. A chuck comprising a pair of members, one of said members beingmoimted to slide upon the other member, one of said members havin teethadapted to pass between the teet of a gear and to .bear against thesolid portion of the latter, the other member having teeth interposedbetween the teeth of the first named member and adapted to bear againstthe gear, said gear upon said members together.

member having clamps extending for wardly without the gear screws toress the gear said mem r.

9. A chuck comprising a pair of mem-- bers, one of said members beingmounted to slide upon the other member; one of said members having teethadapted tO' pass between the teeth of a gear and to bear against thesolid portion of the latter, the other member having teeth interposedbetween the teeth of the first named member and ada ted to bear againstthe gear, clamps mova ly carried by said member, means to cause saidclamps to press the gear against the teeth of said member, and means tosecure said and provided with toward the teeth of 10. A chuck com alurality of members concentric y dis one memher being slidable along theother member, 20 means to secure said members together in settfiiositions, one of said members having tee adapted to pass between theteeth of a gear, the other member having teeth adapted to engage theface of the ar, and 25 means to retain the gear clampe against saidteeth.

Signed at New York city, in the county of New York and State of NewYork, this 25th day of November, A. D. 1913.

CHARLES J. MARKS.

v Witnesses:

' F. WAINRIGHT,

T. F. Barnum,

